code: def test_fail_if_hook_exists(self, scm, dvc):
      self._hook("post-checkout").write_text("hook content")
  
      with pytest.raises(DvcException) as exc_info:  # noqa: PT011
          dvc.install()
  
      assert (
          escape_ansi(str(exc_info.value))
          == "Hook 'post-checkout' already exists. "
          "Please refer to <https://man.dvc.org/install> for more info."
      )
  
file_path: dvc/tests/func/test_install.py
imports: import os
  import pathlib
  import sys
  import pytest
  from git import GitCommandError
  from dvc.exceptions import DvcException
  from dvc_data.hashfile.hash import file_md5
  from tests.func.parsing.test_errors import escape_ansi
label_desc: Use image node_id 4 for calling the TestInstall obj's underlying member method code with example usage: obj.test_fail_if_hook_exists(scm, dvc) without return types